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Put the key in the house away from the car. Take out the seats. Clean and secure the electrical connectors under there. My preference is DeOxit. Check the wires for frays. Put it all back and reset the light. If it stays off you're good to go. 95% of the time. If it comes back on, pay attention to the codes on the Peake SRS reader that you're going to buy to reset the lights. Or pay the cost of the tool to the dealer to reset them with their tool - ONCE.

Key turned in ignition activates test sequence. If the connectors are not connected, you fail and it so very nicely turns the light back on. Leave the key as far from the car as possible.

How do you take out the seats? Try Search. Lots of different tutorials and procedures out there.

Sorry I've never heard of it. But that certainly doesn't mean its no good. Just make sure that's it reads the codes and doesn't just reset the light. At 50% the cost of a Peake its worth a good hard look.